There are actually a few things that could cause a SNES to not turn on (ask me how I discovered this). The main reason is a bad fuse, but you said you checked it and it's good. The next thing to check is the voltage regulator (squarish black box thing with three pins right near the fuse [not sure how familiar you are with circuits]). Test the input and output.; If you have no voltage (or close to it) at the input, then test the components upstream. If you have about 9V going into the regulator and anything other than 5V coming out, then replace the voltage regulator with a new 7805. I actually had a similar issue with my console and ended up on a forum to get answers to it. The issue with my console is that the D1 on the board had blown. Here's a simple way to tell if your D1 is bad: Plug the console in but leave it off. Wait 30 seconds or so then turn it on. If the red light on the front lights up for just an instant then goes out, then your D1 is likely bad. If it is bad, then you should be able to do this repeatedly with the same result each time. Test it to make sure (it's a plain old diode if it needs replacing, or you can just jump it with a wire, which I personally don't recommend). Here's a link to the forum I used and the question I posted, because at the time I was replacing the broken power port as well when I ran into problems. Hopefully it helps you out: http://forum.digitpress.com/forum/showthread.php?174524-SNES-suddenly-has-no-power&p=2034483
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There are actually a few things that could cause a SNES to not turn on (ask me how I discovered this). The main reason is a bad fuse, but you said you checked it and it's good. The next thing to check is the voltage regulator (squarish black box thing with three pins right near the fuse [not sure how familiar you are with circuits]). Test the input and output.; If you have no voltage (or close to it) at the input, then test the components upstream. If you have about 9V going into the regulator and anything other than 5V coming out, then replace the voltage regulator with a new 7805. I actually had a similar issue with my console and ended up on a forum to get answers to it. The issue with my console was that the D1 on the board had blown. Here's a simple way to tell if your D1 is bad: Plug the console in but leave it off. Wait 30 seconds or so then turn it on. If the red light on the front lights up for just an instant then goes out, then your D1 is likely bad. If it is bad, then you should be able to do this repeatedly with the same result each time. Test it to make sure (it's a plain old diode if it needs replacing, or you can just jump it with a wire, which I personally don't recommend). Here's a link to the forum I used and the question I posted, because at the time I was replacing the broken power port as well when I ran into problems. Hopefully it helps you out: http://forum.digitpress.com/forum/showthread.php?174524-SNES-suddenly-has-no-power&p=2034483
There are actually a few things that could cause a SNES to not turn on (ask me how I discovered this). The main reason is a bad fuse, but you said you checked it and it's good. The next thing to check is the voltage regulator (squarish black box thing with three pins right near the fuse [not sure how familiar you are with circuits]). Test the input and output.; If you have no voltage (or close to it) at the input, then test the components upstream. If you have about 9V going into the regulator and anything other than 5V coming out, then replace the voltage regulator with a new 7805. I actually had a similar issue with my console and ended up on a forum to get answers to it. The issue with my console is that the D1 on the board had blown. Here's a simple way to tell if your D1 is bad: Plug the console in but leave it off. Wait 30 seconds or so then turn it on. If the red light on the front lights up for just an instant then goes out, then your D1 is likely bad. If it is bad, then you should be able to do this repeatedly with the same result each time. Test it to make sure (it's a plain old diode if it needs replacing, or you can just jump it with a wire, which I personally don't recommend). Here's a link to the forum I used and the question I posted, because at the time I was replacing the broken power port as well when I ran into problems. Hopefully it helps you out: http://forum.digitpress.com/forum/showthread.php?174524-SNES-suddenly-has-no-power&p=2034483